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公开(公告)号：US20200280287A1
公开(公告)日：2020-09-03
申请号：US16794760
申请日：2020-02-19
Applicant: STMicroelectronics S.r.l.
Inventor： Noemi Gallo , Edoardo Botti
Abstract: A clipping detector circuit includes a timer circuit and a counter circuit. The timer circuit is configured to monitor a time period elapsing since a last occurrence of an edge in a PWM signal, assert a first signal when the time period elapses, and de-assert the first signal and reset the time period as a result of an edge occurring in the PWM signal. The counter circuit is configured to determine a number of pulses in the PWM signal since the last de-assertion of the first signal, and assert a second signal when the number of pulses in the PWM signal since the last de-assertion of the first signal reaches m pulses. The clipping detector circuit is configured to generate a clipping detection signal indicative of whether the pulse-width modulated signal is clipped or not as a function of the first signal and the second signal.
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公开(公告)号：US11251754B2
公开(公告)日：2022-02-15
申请号：US16794760
申请日：2020-02-19
Applicant: STMicroelectronics S.r.l.
Inventor： Noemi Gallo , Edoardo Botti
Abstract: A clipping detector circuit includes a timer circuit and a counter circuit. The timer circuit is configured to monitor a time period elapsing since a last occurrence of an edge in a PWM signal, assert a first signal when the time period elapses, and de-assert the first signal and reset the time period as a result of an edge occurring in the PWM signal. The counter circuit is configured to determine a number of pulses in the PWM signal since the last de-assertion of the first signal, and assert a second signal when the number of pulses in the PWM signal since the last de-assertion of the first signal reaches m pulses. The clipping detector circuit is configured to generate a clipping detection signal indicative of whether the pulse-width modulated signal is clipped or not as a function of the first signal and the second signal.
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公开(公告)号：US10560082B2
公开(公告)日：2020-02-11
申请号：US16151380
申请日：2018-10-04
Applicant: STMicroelectronics S.r.l.
Inventor： Edoardo Botti , Noemi Gallo
Abstract: In an embodiment, a PWM modulation circuit includes a first circuit block configured to receive a square wave input signal and produce from the square wave input signal a triangular wave signal, a second circuit block configured to receive a modulating signal and produce a PWM signal by comparing the modulating signal with a carrier signal, a switching circuit block coupled between the first circuit block and the second circuit block and sensitive to reference signals having upper and lower reference values and selectively switchable between a carrier transfer setting in which the switching circuit block couples the first circuit block to the second circuit block to transfer the triangular wave signal as the carrier signal, and one or more carrier forcing settings for optimizing or inhibiting pulse skipping in the PWM signal, wherein the switching circuit block forces the carrier signal to the upper and lower reference values, respectively.
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公开(公告)号：US20190123731A1
公开(公告)日：2019-04-25
申请号：US16151380
申请日：2018-10-04
Applicant: STMicroelectronics S.r.l.
Inventor： Edoardo Botti , Noemi Gallo
CPC classification number: H03K7/08 , H03F1/26 , H03F3/181 , H03F3/217 , H03F2200/03 , H03K4/08 , H03K5/1252
Abstract: In an embodiment, a PWM modulation circuit includes a first circuit block configured to receive a square wave input signal and produce from the square wave input signal a triangular wave signal, a second circuit block configured to receive a modulating signal and produce a PWM signal by comparing the modulating signal with a carrier signal, a switching circuit block coupled between the first circuit block and the second circuit block and sensitive to reference signals having upper and lower reference values and selectively switchable between a carrier transfer setting in which the switching circuit block couples the first circuit block to the second circuit block to transfer the triangular wave signal as the carrier signal, and one or more carrier forcing settings for optimizing or inhibiting pulse skipping in the PWM signal, wherein the switching circuit block forces the carrier signal to the upper and lower reference values, respectively.
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